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The Vedas (Sanskrit वेदाः véda, "knowledge") are a large body of texts originating in ancient India. Composed in Vedic Sanskrit, the texts constitute the oldest layer of Sanskrit literature and the oldest scriptures of Hinduism.^[1][2] The Vedas are apauruṣeya ("not of human agency").^[3][4][5] They are supposed to have been directly revealed, and thus are called śruti ("what is heard"),^[6][7] distinguishing them from other religious texts, which are called smṛti ("what is remembered").

The Vedic texts or śruti are organized around four canonical collections of metrical material known as Saṃhitās, of which the first three are related to the performance of yajna (sacrifice) in historical Vedic religion:

1. The Rigveda, containing hymns to be recited by the hotṛ;
2. The Yajurveda, containing formulas to be recited by the adhvaryu or officiating priest;
3. The Samaveda, containing formulas to be sung by the udgātṛ.
4. The fourth is the Atharvaveda, a collection of spells and incantations, apotropaic charms and speculative hymns.^[8]

The individual verses contained in these compilations are known as mantras. Some selected Vedic mantras are still recited at prayers, religious functions and other auspicious occasions in contemporary Hinduism.

The various Indian philosophies and sects have taken differing positions on the Vedas. Schools of Indian philosophy which cite the Vedas as their scriptural authority are classified as "orthodox" (āstika). Other traditions, notably Buddhism and Jainism, which did not regard the Vedas as authorities are referred to by traditional Hindu texts as "heterodox" or "non-orthodox" (nāstika) schools.^[9][10] In addition to Buddhism and Jainism, Sikhism^[11][12] and Brahmoism,^[13] many non-Brahmin Hindus in South India ^[14] do not accept the authority of the Vedas. Certain South Indian Brahmin communities such as Iyengars consider the Tamil Divya Prabandham or writing of the Alvar saints as equivalent to the Vedas.^[15]

Etymology and usage[link]

The Sanskrit word véda "knowledge, wisdom" is derived from the root vid- "to know". This is reconstructed as being derived from the Proto-Indo-European root *u̯eid-, meaning "see" or "know".^[16]

As a noun, the word appears only in a single instance in the Rigveda, in RV 8.19.5, translated by Griffith as "ritual lore":

yáḥ samídhā yá âhutī / yó védena dadâśa márto agnáye / yó námasā svadhvaráḥ

"The mortal who hath ministered to Agni with oblation, fuel, ritual lore, and reverence, skilled in sacrifice."^[17]

The noun is from Proto-Indo-European *u̯eidos, cognate to Greek (ϝ)εἶδος "aspect", "form" . Not to be confused is the homonymous 1st and 3rd person singular perfect tense véda, cognate to Greek (ϝ)οἶδα (w)oida "I know". Root cognates are Greek ἰδέα, English wit, etc., Latin videō "I see", etc.^[18]

In English, the term Veda is often used loosely to refer to the Samhitas (collection of mantras, or chants) of the four canonical Vedas (Rigveda, Yajurveda, Samaveda and Atharvaveda).

The Sanskrit term veda as a common noun means "knowledge", but can also be used to refer to fields of study unrelated to liturgy or ritual, e.g. in agada-veda "medical science", sasya-veda "science of agriculture" or sarpa-veda "science of snakes" (already found in the early Upanishads); durveda means "with evil knowledge, ignorant".^[19]

Chronology[link]

The Vedas are among the oldest sacred texts. The Samhitas date to roughly 1500–1000 BCE, and the "circum-Vedic" texts, as well as the redaction of the Samhitas, date to c. 1000-500 BCE, resulting in a Vedic period, spanning the mid 2nd to mid 1st millennium BCE, or the Late Bronze Age and the Iron Age.^[20] The Vedic period reaches its peak only after the composition of the mantra texts, with the establishment of the various shakhas all over Northern India which annotated the mantra samhitas with Brahmana discussions of their meaning, and reaches its end in the age of Buddha and Panini and the rise of the Mahajanapadas (archaeologically, Northern Black Polished Ware). Michael Witzel gives a time span of c. 1500 BCE to c. 500-400 BCE. Witzel makes special reference to the Near Eastern Mitanni material of the 14th c. BCE the only epigraphic record of Indo-Aryan contemporary to the Rigvedic period. He gives 150 BCE (Patañjali) as a terminus ante quem for all Vedic Sanskrit literature, and 1200 BCE (the early Iron Age) as terminus post quem for the Atharvaveda.^[21]

Transmission of texts in the Vedic period was by oral tradition alone, preserved with precision with the help of elaborate mnemonic techniques. A literary tradition set in only in post-Vedic times, after the rise of Buddhism in the Maurya period, perhaps earliest in the Kanva recension of the Yajurveda about the 1st century BCE; however oral tradition predominated until c. 1000 CE.^[22]

Due to the ephemeral nature of the manuscript material (birch bark or palm leaves), surviving manuscripts rarely surpass an age of a few hundred years.^[23] The Benares Sanskrit University has a Rigveda manuscript of the mid-14th century; however, there are a number of older Veda manuscripts in Nepal belonging to the Vajasaneyi tradition that are dated from the 11th century onwards.

Categories of Vedic texts[link]

The term "Vedic texts" is used in two distinct meanings:

1. Texts composed in Vedic Sanskrit during the Vedic period (Iron Age India)
2. Any text considered as "connected to the Vedas" or a "corollary of the Vedas"^[24]

Vedic Sanskrit corpus[link]

The corpus of Vedic Sanskrit texts includes:

• The Samhita (Sanskrit saṃhitā, "collection"), are collections of metric texts ("mantras"). There are four "Vedic" Samhitas: the Rig-Veda, Sama-Veda, Yajur-Veda, and Atharva-Veda, most of which are available in several recensions (śākhā). In some contexts, the term Veda is used to refer to these Samhitas. This is the oldest layer of Vedic texts, apart from the Rigvedic hymns, which were probably essentially complete by 1200 BC, dating to ca. the 12th to 10th centuries BC. The complete corpus of Vedic mantras as collected in Bloomfield's Vedic Concordance (1907) consists of some 89,000 padas (metric feet), of which 72,000 occur in the four Samhitas.^[25]
• The Brahmanas are prose texts that discuss, in technical fashion, the solemn sacrificial rituals as well as comment on their meaning and many connected themes. Each of the Brahmanas is associated with one of the Samhitas or its recensions. The Brahmanas may either form separate texts or can be partly integrated into the text of the Samhitas. They may also include the Aranyakas and Upanishads.
• The Aranyakas, "wilderness texts" or "forest treaties", were composed by people who meditated in the woods as recluses and are the third part of the Vedas. The texts contain discussions and interpretations of dangerous rituals (to be studied outside the settlement) and various sorts of additional materials. It is frequently read in secondary literature.
• Some of the older Mukhya Upanishads (Bṛhadāraṇyaka, Chandogya, Kaṭha).^[26][27]
• Certain Sūtra literature, i.e. the Shrautasutras and the Grhyasutras.

The Shrauta Sutras, regarded as belonging to the smriti, are late Vedic in language and content, thus forming part of the Vedic Sanskrit corpus.^[27][28] The composition of the Shrauta and Grhya Sutras (ca. 6th century BC) marks the end of the Vedic period, and at the same time the beginning of the flourishing of the "circum-Vedic" scholarship of Vedanga, introducing the early flowering of classical Sanskrit literature in the Mauryan and Gupta periods.

While production of Brahmanas and Aranyakas ceases with the end of the Vedic period, there is a large number of Upanishads composed after the end of the Vedic period. While most of the ten Mukhya Upanishads can be considered to date to the Vedic or Mahajanapada period, most of the 108 Upanishads of the full Muktika canon date to the Common Era.

The Brahmanas, Aranyakas, and Upanishads often interpret the polytheistic and ritualistic Samhitas in philosophical and metaphorical ways to explore abstract concepts such as the Absolute (Brahman), and the soul or the self (Atman), introducing Vedanta philosophy, one of the major trends of later Hinduism.

The Vedic Sanskrit corpus is the scope of A Vedic Word Concordance (Vaidika-Padānukrama-Koṣa) prepared from 1930 under Vishva Bandhu, and published in five volumes in 1935-1965. Its scope extends to about 400 texts, including the entire Vedic Sanskrit corpus besides some "sub-Vedic" texts.

Volume I: Samhitas

Volume II: Brahmanas and Aranyakas

Volume III: Upanishads

Volume IV: Vedangas

A revised edition, extending to about 1800 pages, was published in 1973-1976.

Shruti literature[link]

The texts considered "Vedic" in the sense of "corollaries of the Vedas" is less clearly defined, and may include numerous post-Vedic texts such as Upanishads or Sutra literature. These texts are by many Hindu sects considered to be shruti (Sanskrit: śruti; "the heard"), divinely revealed like the Vedas themselves. Texts not considered to be shruti are known as smriti (Sanskrit: smṛti; "the remembered"), of human origin. This indigenous system of categorization was adopted by Max Müller and, while it is subject to some debate, it is still widely used. As Axel Michaels explains:

These classifications are often not tenable for linguistic and formal reasons: There is not only one collection at any one time, but rather several handed down in separate Vedic schools; Upanişads ... are sometimes not to be distinguished from Āraṇyakas...; Brāhmaṇas contain older strata of language attributed to the Saṃhitās; there are various dialects and locally prominent traditions of the Vedic schools. Nevertheless, it is advisable to stick to the division adopted by Max Müller because it follows the Indian tradition, conveys the historical sequence fairly accurately, and underlies the current editions, translations, and monographs on Vedic literature."^[26]

The Upanishads are largely philosophical works in dialog form. They discuss questions of nature philosophy and the fate of the soul, and contain some mystic and spiritual interpretations of the Vedas. For long, they have been regarded as their putative end and essence, and are thus known as Vedānta ("the end of the Vedas"). Taken together, they are the basis of the Vedanta school.

Vedic schools or recensions[link]

Study of the extensive body of Vedic texts has been organized into a number of different schools or branches (Sanskrit śākhā, literally "branch" or "limb") each of which specialized in learning certain texts.^[29] Multiple recensions are known for each of the Vedas, and each Vedic text may have a number of schools associated with it. Elaborate methods for preserving the text were based on memorizing by heart instead of writing. Specific techniques for parsing and reciting the texts were used to assist in the memorization process. (See also: Vedic chant)

Prodigous energy was expended by ancient Indian culture in ensuring that these texts were transmitted from generation to generation with inordinate fidelity.^[30] For example, memorization of the sacred Vedas included up to eleven forms of recitation of the same text. The texts were subsequently "proof-read" by comparing the different recited versions. Forms of recitation included the jaṭā-pāṭha (literally "mesh recitation") in which every two adjacent words in the text were first recited in their original order, then repeated in the reverse order, and finally repeated again in the original order.^[31]

That these methods have been effective, is testified to by the preservation of the most ancient Indian religious text, the Ṛigveda, as redacted into a single text during the Brahmana period, without any variant readings.^[31]

The four Vedas[link]

Rigveda (padapatha) manuscript in Devanagari, early 19th century

Part of a series on Hindu scriptures
Vedas and their Shakhas
Rig Veda[32] Shakala Bhashkala
Sama Veda[32] Ranayana Shatyamukhya Vyasa Bhaguri Olundi Goulgulvi Bhanumanoupamayava Karati Mashaka Argya Varshgagavya Kuthuma Shakugitre Jaiminiya
Krishna Yajurveda[32][33] Taittiriya Samhita Maitrayani Samhita Karaka Katha Samhita Kapisthala Kahta Samhita Kathaka
Shukla Yajurveda[33] Kanava Madhyandin
Atharvaveda[33] Shaunaka Paippalada Stauda Mauda Jajala Jalada Kuntap Brahmavada Devadarsa Caranavaidya
Hinduism portal
v t e

The canonical division of the Vedas is fourfold (turīya) viz.,^[34]

1. Rigveda (RV)
2. Yajurveda (YV, with the main division TS vs. VS)
3. Sama-Veda (SV)
4. Atharva-Veda (AV)

Of these, the first three were the principal original division, also called "trayī vidyā", that is, "the triple sacred science" of reciting hymns (RV), performing sacrifices (YV), and chanting (SV).^[35][36] This triplicity is so introduced in the Brahmanas (ShB, ABr and others), but the Rigveda is the older work of the three from which the other two borrow, next to their own independent Yajus, sorcery and speculative mantras.

Thus, the Mantras are properly of three forms: 1. Ric, which are verses of praise in metre, and intended for loud recitation; 2. Yajus, which are in prose, and intended for recitation in lower voice at sacrifices; 3. Sāman, which are in metre, and intended for singing at the Soma ceremonies.

The Yajurveda, Samaveda and Atharvaveda are independent collections of mantras and hymns intended as manuals for the Adhvaryu, Udgatr and Brahman priests respectively.

The Atharvaveda is the fourth Veda. Its status has occasionally been ambiguous, probably due to its use in sorcery and healing. However, it contains very old materials in early Vedic language. Manusmrti, which often speaks of the three Vedas, calling them trayam-brahma-sanātanam, "the triple eternal Veda". The Atharvaveda like the Rigveda, is a collection of original incantations, and other materials borrowing relatively little from the Rigveda. It has no direct relation to the solemn Śrauta sacrifices, except for the fact that the mostly silent Brahmán priest observes the procedures and uses Atharvaveda mantras to 'heal' it when mistakes have been made. Its recitation also produces long life, cures diseases, or effects the ruin of enemies.

Each of the four Vedas consists of the metrical Mantra or Samhita and the prose Brahmana part, giving discussions and directions for the detail of the ceremonies at which the Mantras were to be used and explanations of the legends connected with the Mantras and rituals. Both these portions are termed shruti (which tradition says to have been heard but not composed or written down by men). Each of the four Vedas seems to have passed to numerous Shakhas or schools, giving rise to various recensions of the text. They each have an Index or Anukramani, the principal work of this kind being the general Index or Sarvānukramaṇī.

Rigveda[link]

The Rigveda Samhita is the oldest extant Indic text.^[37] It is a collection of 1,028 Vedic Sanskrit hymns and 10,600 verses in all, organized into ten books (Sanskrit: mandalas).^[38] The hymns are dedicated to Rigvedic deities.^[39]

The books were composed by poets from different priestly groups over a period of several centuries, commonly dated to the period of roughly the second half of the 2nd millennium BCE (the early Vedic period) in the Punjab (Sapta Sindhu) region of the Indian subcontinent.^[40]

There are strong linguistic and cultural similarities between the Rigveda and the early Iranian Avesta, deriving from the Proto-Indo-Iranian times, often associated with the Andronovo culture; the earliest horse-drawn chariots were found at Andronovo sites in the Sintashta-Petrovka cultural area near the Ural Mountains and date to ca. 2000 BCE.^[41]

Rig Veda manuscripts have been selected for inscription in UNESCO's "Memory of the World" Register 2007.^[42]

Yajurveda[link]

The Yajurveda Samhita consists of archaic prose mantras and also in part of verses borrowed and adapted from the Rigveda. Its purpose was practical, in that each mantra must accompany an action in sacrifice but, unlike the Samaveda, it was compiled to apply to all sacrificial rites, not merely the Somayajna. There are two major groups of recensions of this Veda, known as the "Black" (Krishna) and "White" (Shukla) Yajurveda (Krishna and Shukla Yajurveda respectively). While White Yajurveda separates the Samhita from its Brahmana (the Shatapatha Brahmana), the e Black Yajurveda intersperses the Samhita with Brahmana commentary. Of the Black Yajurveda four major recensions survive (Maitrayani, Katha, Kapisthala-Katha, Taittiriya).

Samaveda[link]

The Samaveda Samhita (from sāman, the term for a melody applied to metrical hymn or song of praise^[43]) consists of 1549 stanzas, taken almost entirely (except for 78 stanzas) from the Rigveda.^[26] Like the Rigvedic stanzas in the Yajurveda, the Samans have been changed and adapted for use in singing. Some of the Rigvedic verses are repeated more than once. Including repetitions, there are a total of 1875 verses numbered in the Samaveda recension translated by Griffith.^[44] Two major recensions remain today, the Kauthuma/Ranayaniya and the Jaiminiya. Its purpose was liturgical, as the repertoire of the udgātṛ or "singer" priests who took part in the sacrifice.

Atharvaveda[link]

The Artharvaveda Samhita is the text 'belonging to the Atharvan and Angirasa poets. It has 760 hymns, and about 160 of the hymns are in common with the Rigveda.^[45] Most of the verses are metrical, but some sections are in prose.^[45] It was compiled around 900 BCE, although some of its material may go back to the time of the Rigveda,^[46] and some parts of the Atharva-Veda are older than the Rig-Veda^[45] though not in linguistic form.

The Atharvaveda is preserved in two recensions, the Paippalāda and Śaunaka.^[45] According to Apte it had nine schools (shakhas).^[47] The Paippalada text, which exists in a Kashmir and an Orissa version, is longer than the Saunaka one; it is only partially printed in its two versions and remains largely untranslated.

Unlike the other three Vedas, the Atharvanaveda has less connection with sacrifice.^[48][49] Its first part consists chiefly of spells and incantations, concerned with protection against demons and disaster, spells for the healing of diseases, for long life and for various desires or aims in life.^[45][50]

The second part of the text contains speculative and philosophical hymns.^[51]

The Atharvaveda is a comparatively late extension of the "Three Vedas" connected to priestly sacrifice to a canon of "Four Vedas". This may be connected to an extension of the sacrificial rite from involving three types of priest to the inclusion of the Brahman overseeing the ritual.^[52]

The Atharvaveda is concerned with the material world or world of man and in this respect differs from the other three vedas. Atharvaveda also sanctions the use of force, in particular circumstances and similarly this point is a departure from the three other vedas.

Brahmanas[link]

The mystical notions surrounding the concept of the one "Veda" that would flower in Vedantic philosophy have their roots already in Brahmana literature, for example in the Shatapatha Brahmana. The Vedas are identified with Brahman, the universal principle (ŚBM 10.1.1.8, 10.2.4.6). Vāc "speech" is called the "mother of the Vedas" (ŚBM 6.5.3.4, 10.5.5.1). The knowledge of the Vedas is endless, compared to them, human knowledge is like mere handfuls of dirt (TB 3.10.11.3-5). The universe itself was originally encapsulated in the three Vedas (ŚBM 10.4.2.22 has Prajapati reflecting that "truly, all beings are in the triple Veda").

Vedanta[link]

Veda Vyasa attributed to have compiled the Vedas

While contemporary traditions continued to maintain Vedic ritualism (Śrauta, Mimamsa), Vedanta renounced all ritualism and radically re-interpreted the notion of "Veda" in purely philosophical terms. The association of the three Vedas with the bhūr bhuvaḥ svaḥ mantra is found in the Aitareya Aranyaka: "Bhūḥ is the Rigveda, bhuvaḥ is the Yajurveda, svaḥ is the Samaveda" (1.3.2). The Upanishads reduce the "essence of the Vedas" further, to the syllable Aum (ॐ). Thus, the Katha Upanishad has:

"The goal, which all Vedas declare, which all austerities aim at, and which humans desire when they live a life of continence, I will tell you briefly it is Aum" (1.2.15)

In post-Vedic literature[link]

Vedanga[link]

Six technical subjects related to the Vedas are traditionally known as vedāṅga "limbs of the Veda". V. S. Apte defines this group of works as:

"N. of a certain class of works regarded as auxiliary to the Vedas and designed to aid in the correct pronunciation and interpretation of the text and the right employment of the Mantras in ceremonials."^[53]

These subjects are treated in Sūtra literature dating from the end of the Vedic period to Mauryan times, seeing the transition from late Vedic Sanskrit to Classical Sanskrit.

The six subjects of Vedanga are:

• Phonetics (Śikṣā)
• Ritual (Kalpa)
• Grammar (Vyākaraṇa)
• Etymology (Nirukta)
• Meter (Chandas)
• Astronomy (Jyotiṣa)

Parisista[link]

Pariśiṣṭa "supplement, appendix" is the term applied to various ancillary works of Vedic literature, dealing mainly with details of ritual and elaborations of the texts logically and chronologically prior to them: the Samhitas, Brahmanas, Aranyakas and Sutras. Naturally classified with the Veda to which each pertains, Parisista works exist for each of the four Vedas. However, only the literature associated with the Atharvaveda is extensive.

• The Āśvalāyana Gṛhya Pariśiṣṭa is a very late text associated with the Rigveda canon.
• The Gobhila Gṛhya Pariśiṣṭa is a short metrical text of two chapters, with 113 and 95 verses respectively.
• The Kātiya Pariśiṣṭas, ascribed to Kātyāyana, consist of 18 works enumerated self-referentially in the fifth of the series (the Caraṇavyūha)and the Kātyāyana Śrauta Sūtra Pariśiṣṭa.
• The Kṛṣṇa Yajurveda has 3 parisistas The Āpastamba Hautra Pariśiṣṭa, which is also found as the second praśna of the Satyasāḍha Śrauta Sūtra', the Vārāha Śrauta Sūtra Pariśiṣṭa
• For the Atharvaveda, there are 79 works, collected as 72 distinctly named parisistas.^[54]

Puranas[link]

A traditional view given in the Vishnu Purana (likely dating to the Gupta period^[55]) attributes the current arrangement of four Vedas to the mythical sage Vedavyasa.^[56] Puranic tradition also postulates a single original Veda that, in varying accounts, was divided into three or four parts. According to the Vishnu Purana (3.2.18, 3.3.4 etc.) the original Veda was divided into four parts, and further fragmented into numerous shakhas, by Lord Vishnu in the form of Vyasa, in the Dvapara Yuga; the Vayu Purana (section 60) recounts a similar division by Vyasa, at the urging of Brahma. The Bhagavata Purana (12.6.37) traces the origin of the primeval Veda to the syllable aum, and says that it was divided into four at the start of Dvapara Yuga, because men had declined in age, virtue and understanding. In a differing account Bhagavata Purana (9.14.43) attributes the division of the primeval veda (aum) into three parts to the monarch Pururavas at the beginning of Treta Yuga. The Mahabharata (santiparva 13,088) also mentions the division of the Veda into three in Treta Yuga.^[57]

Upaveda[link]

The term upaveda ("applied knowledge") is used in traditional literature to designate the subjects of certain technical works.^[58][59] Lists of what subjects are included in this class differ among sources. The Charanavyuha mentions four Upavedas:

• Medicine (Āyurveda), associated with the Rigveda
• Archery (Dhanurveda), associated with the Yajurveda
• Music and sacred dance (Gāndharvaveda), associated with the Samaveda
• Military science (Shastrashastra), associated with the Atharvaveda

But Sushruta and Bhavaprakasha mention Ayurveda as an upaveda of the Atharvaveda. Sthapatyaveda (architecture), Shilpa Shastras (arts and crafts) are mentioned as fourth upaveda according to later sources.

Buddhist and Jain views[link]

Buddhism and Jainism do not reject the Vedas, but merely their absolute authority.^{[citation needed]}

Buddhism[link]

In the Buddhist Vinaya Pitaka of the Mahavagga (I.245)^[60] section the Buddha declared that the Veda in its true form was declared to the Vedic rishis "Atthako, Vâmako, Vâmadevo, Vessâmitto, Yamataggi, Angiraso, Bhâradvâjo, Vâsettho, Kassapo, and Bhagu"^[61] but that it was altered by a few Brahmins who introduced animal sacrifices. The Vinaya Pitaka's section Anguttara Nikaya: Panchaka Nipata says that it was on this alteration of the true Veda that the Buddha refused to pay respect to the Vedas of his time.^[62]

Also in the "Brahmana Dhammika Sutta" (II,7)^[63] of the Suttanipata section of Vinaya Pitaka^[64] there is a story of when the Buddha was in Jetavana village and there were a group of elderly Brahmin ascetics who sat down next to the Buddha and asked him, "Do the present Brahmans follow the same rules, practise the same rites, as those in the more ancient times?" The Buddha replied, "No." The elderly Brahmins asked the Buddha that if it were not inconvenient for him, that he would tell them of the Brahmana Dharma of the previous generation. The Buddha replied: "There were formerly rishis, men who had subdued all passion by the keeping of the sila precepts and the leading of a pure life...Their riches and possessions consisted in the study of the Veda and their treasure was a life free from all evil...The Brahmans, for a time, continued to do right and received in alms rice, seats, clothes, and oil, though they did not ask for them. The animals that were given they did not kill; but they procured useful medicaments from the cows, regarding the as friends and relatives, whose products give strength, beauty and health." So in this passage also the Buddha describes when the Brahmins were studying the Veda but the animal sacrifice customs had not yet began.

The Buddha was declared to have been born as a Brahmin who was a knower of the Vedas and its philosophies in a number of his previous lives according to Buddhist scriptures. Other Buddhas too were said to have been born as Brahmins that were trained in the Vedas.

The Mahasupina Jataka^[65] and Lohakumbhi Jataka^[66] declares that Brahmin Sariputra in a previous life was a Brahmin that prevented animal sacrifice by declaring that animal sacrifice was actually against the Vedas.

Jainism[link]

A Jain sage intereprets the Vedic sacrifices as metaphorical:

"Body is the altar, mind is the fire blazing with the ghee of knowledge and burning the sacrificial sticks of impurities produced from the tree of karma;..."^[67]

Further, Jain Sage Jinabhadra in his Visesavasyakabhasya cites a numeber of passages from the Vedic Upanishads.^[68]

Jain are in conformity with the Vedas in reference to both the Vedas' and Jainism' acceptance of the 22 Tirthankaras:

Of Rishabha (1st Tirthankara Rishabha) is written:

"But Risabha went on, unperturbed by anything till he became sin-free like a conch that takes no black dot, without obstruction ... which is the epithet of the First World-teacher, may become the destroyer of enemies" (Rig Veda X.166)

Of Aristanemi (Tirthankara Neminatha) is written:

"So asmakam Aristanemi svaha Arhan vibharsi sayakani dhanvarhanistam yajatam visvarupam arhannidam dayase" (Astak 2, Varga 7, Rig Veda)

"Fifth" and other Vedas[link]

Some post-Vedic texts, including the Mahabharata, the Natyasastra and certain Puranas, refer to themselves as the "fifth Veda".^[69] The earliest reference to such a "fifth Veda" is found in the Chandogya Upanishad. "Dravida Veda" is a term for canonical Tamil Bhakti texts.^{[citation needed]}

Other texts such as the Bhagavad Gita or the Vedanta Sutras are considered shruti or "Vedic" by some Hindu denominations but not universally within Hinduism. The Bhakti movement, and Gaudiya Vaishnavism in particular extended the term veda to include the Sanskrit Epics and Vaishnavite devotional texts such as the Pancaratra.^[70]

Western Indology[link]

The study of Sanskrit in the West began in the 17th century. In the early 19th century, Arthur Schopenhauer drew attention to Vedic texts, specifically the Upanishads. The importance of Vedic Sanskrit for Indo-European studies was also recognized in the early 19th century. English translations of the Samhitas were published in the later 19th century, in the Sacred Books of the East series edited by Müller between 1879 and 1910.^[71] Ralph T. H. Griffith also presented English translations of the four Samhitas, published 1889 to 1899.

See also[link]

• Hindu Philosophy
• Historical Vedic religion
• Pandit
• Shakha
• Vedic chant

Notes[link]

References[link]

• Apte, Vaman Shivram (1965), The Practical Sanskrit Dictionary (4th revised & enlarged ed.), Delhi: Motilal Banarsidass, ISBN 81-208-0567-4 .
• Avari, Burjor (2007), India: The Ancient Past, London: Routledge, ISBN 978-0-415-35616-9 
• Flood, Gavin (1996), An Introduction to Hinduism, Cambridge University Press, ISBN 0-521-43878-0 
• Flood, Gavin, ed. (2003), The Blackwell Companion to Hinduism, Malden, MA: Blackwell, ISBN 1-4051-3251-5 
• Holdrege, Barbara A. (1995), Veda and Torah, SUNY Press, ISBN 0-7914-1639-9 
• MacDonell, Arthur Anthony (2004), A History of Sanskrit Literature, Kessinger Publishing, ISBN 1-4179-0619-7 
• Michaels, Axel (2004), Hinduism: Past and Present, Princeton University Press, ISBN 0-691-08953-1 
• Monier-Williams, Monier, ed. (2006), Monier-Williams Sanskrit Dictionary, Nataraj Books, ISBN 1-881338-58-4 .
• Muir, John (1861), Original Sanskrit Texts on the Origin and Progress of the Religion and Institutions of India, Williams and Norgate, http://books.google.com/?id=_VCXTBk-PtoC 
• Müller, Max (1891), Chips from a German Workshop, New York: C. Scribner's sons, http://books.google.com/?id=J8Zo_rtoWAEC .
• Radhakrishnan, Sarvepalli; Moore, Charles A., eds. (1957), A Sourcebook in Indian Philosophy (12th Princeton Paperback ed.), Princeton University Press, ISBN 0-691-01958-4 .
• Smith, Brian K., Canonical Authority and Social Classification: Veda and "Varṇa" in Ancient Indian Texts-, History of Religions, The University of Chicago Press (1992), 103-125.
• Sullivan, B. M. (Summer 1994), "The Religious Authority of the Mahabharata: Vyasa and Brahma in the Hindu Scriptural Tradition", Journal of the American Academy of Religion 62 (1): 377–401, DOI:10.1093/jaarel/LXII.2.377. 
• Witzel, Michael (ed.) (1997), Inside the Texts, Beyond the Texts. New Approaches to the Study of the Vedas, Harvard Oriental Series, Opera Minora vol. 2, Cambridge: Harvard University Press 
• Zaehner, R. C. (1966), Hindu Scriptures, London: Everyman's Library 

Literature[link]

Overviews

• J. Gonda, Vedic Literature: Saṃhitās and Brāhmaṇas, A History of Indian literature. Vol. 1, Veda and Upanishads (1975), ISBN 978-3-447-01603-2.
• J. A. Santucci, An Outline of Vedic Literature (1976).
• S. Shrava, A Comprehensive History of Vedic Literature — Brahmana and Aranyaka Works, Pranava Prakashan (1977).

Concordances

• M. Bloomfield, A Vedic Concordance (1907)
• Vishva Bandhu, Bhim Dev, S. Bhaskaran Nair (eds.), Vaidika-Padānukrama-Koṣa: A Vedic Word-Concordance, Vishveshvaranand Vedic Research Institute, Hoshiarpur, 1963–1965, revised edition 1973-1976.

Conference proceedings

• Griffiths, Arlo and Houben, Jan E. M. (eds.), The Vedas : texts, language & ritual: proceedings of the Third International Vedic Workshop, Leiden 2002, Groningen Oriental Studies 20, Groningen : Forsten, (2004), ISBN 90-6980-149-3.

External links[link]

Wikimedia Commons has media related to: Vedas

Look up Vedic in Wiktionary, the free dictionary.

Look up Veda in Wiktionary, the free dictionary.

• GRETIL etexts
• The Vedas at sacred-texts.com
• Vedas: Rig, Sama, Yajur, and Atharva
• Vedas and Upanishads Complete set

v t e Hindu deities and texts Gods Deva Ganesha Brahma Vishnu Shiva Rama Krishna Murugan Hanuman Indra Surya more Goddesses Adi parashakti Devi Saraswati Lakshmi Sati Parvati Durga Shakti Kali Sita Radha Mahavidya Navadurga Matrikas more Texts Vedas Upanishads Puranas Ramayana Mahabharata Bhagavad Gita more Hinduism Hindu mythology

Carl Sagan
Sagan in 1980
Born	(1934-11-09)November 9, 1934 Brooklyn, New York, U.S.
Died	December 20, 1996(1996-12-20) (aged 62) Seattle, Washington, U.S.
Residence	United States[1]
Nationality	United States
Fields	Astronomy, astrophysics, cosmology, astrobiology, space science, planetary science
Institutions	Cornell University Harvard University Smithsonian Astrophysical Observatory University of California, Berkeley
Alma mater	University of Chicago (B.A.), (B.Sc.), (M.Sc.), (PhD)
Known for	Search for Extra-Terrestrial Intelligence (SETI) Cosmos: A Personal Voyage Cosmos Voyager Golden Record Pioneer plaque Contact Pale Blue Dot
Notable awards	NASA Distinguished Public Service Medal (1977) Pulitzer Prize for General Non-Fiction (1978) Oersted Medal (1990) National Academy of Sciences Public Welfare Medal (1994)

Carl Edward Sagan ( /ˈseɪɡɪn/; November 9, 1934 – December 20, 1996) was an American astronomer, astrophysicist, cosmologist, author, science popularizer, and science communicator in astronomy and natural sciences. He published more than 600 scientific papers^[2] and articles and was author, co-author or editor of more than 20 books. He advocated scientifically skeptical inquiry and the scientific method, pioneered exobiology and promoted the Search for Extra-Terrestrial Intelligence (SETI).

Sagan is known for his popular science books and for the award-winning 1980 television series Cosmos: A Personal Voyage, which he narrated and co-wrote.^[3] The book Cosmos was published to accompany the series. Sagan wrote the novel Contact, the basis for a 1997 film of the same name.

Early life[link]

Carl Sagan was born in Brooklyn, New York,^[4] to a Ukrainian Jewish family. His father, Sam Sagan, was an immigrant garment worker from Kamenets-Podolsk, Ukraine;^[5] his mother, Rachel Molly Gruber, a housewife. Carl was named in honor of Rachel's biological mother, Chaiya Clara, in Sagan's words, "the mother she never knew." Sagan graduated from Rahway High School in Rahway, New Jersey, in 1951.^[6]

He had a sister, Carol, and the family lived in a modest apartment near the Atlantic Ocean, in Bensonhurst, a Brooklyn neighborhood. According to Sagan, they were Reform Jews, the most liberal of the three main Jewish groups. Both Sagan and his sister agree that their father was not especially religious, but that their mother "definitely believed in God, and was active in the temple ... and served only Kosher meat."^[6]:12 During the height of the Depression, his father had to accept a job as a theater usher.

According to biographer Keay Davidson, Sagan's "inner war" was a result of his close relations with both his parents, who were in many ways "opposites." Sagan traced his later analytical urges to his mother, a woman who had known "extreme poverty as a child," and had grown up almost homeless in New York City during World War I and the 1920s.^[6]:2 She had her own intellectual ambitions as a young woman, but they were blocked by social restrictions, because of her poverty, her being a woman and wife, and her Jewish ethnicity. Davidson notes that she therefore "worshiped her only son, Carl. He would fulfill her unfulfilled dreams."^[6]:2

However, his "sense of wonder" came from his father, who was a "quiet and soft-hearted escapee from the Czar." In his free time, he gave apples to the poor, or helped soothe labor-management tensions within New York's "tumultuous" garment industry.^[6]:2 Although he was "awed" by Carl's "brilliance, his boyish chatter about stars and dinosaurs," he took his son's inquisitiveness in stride, as part of his growing up.^[6]:2 In his later years as a writer and scientist, Sagan would often draw on his childhood memories to illustrate scientific points, as he did in his book, Shadows of Forgotten Ancestors.^[6]:9 Sagan describes his parents' influence on his later thinking:

My parents were not scientists. They knew almost nothing about science. But in introducing me simultaneously to skepticism and to wonder, they taught me the two uneasily cohabiting modes of thought that are central to the scientific method.^[7]

1939 World's Fair[link]

Sagan recalls that one of his best experiences was when he was four or five years old, his parents took him to the 1939 New York World's Fair. The exhibits became a turning point in his life. He later recalled the moving map of the "America of Tomorrow" exhibit: "It showed beautiful highways and cloverleaves and little General Motors cars all carrying people to skyscrapers, buildings with lovely spires, flying buttresses—and it looked great!"^[6]:14 At other exhibits, he remembered how a flashlight that shined on a photoelectric cell created a cracking sound, and how the sound from a tuning fork became a wave on an oscilloscope. He also witnessed the future media technology that would replace radio: television. Sagan wrote:

Plainly, the world held wonders of a kind I had never guessed. How could a tone become a picture and light become a noise?^[6]:14

He also saw one of the Fair's most publicized events, the burial of a time capsule at Flushing Meadows, which contained mementos of the 1930s to be recovered by Earth's descendants in a future millennium. "The time capsule thrilled Carl," writes Davidson. As an adult, Sagan and his colleagues created similar time capsules, but ones that would be sent out into the galaxy. These were the Pioneer plaque and the Voyager Golden Record records, all of which were spinoffs of Sagan's memories of the World Fair.^[6]:15

World War II[link]

During World War II, Sagan's family worried about the fate of their European relatives. Sagan, however, was generally unaware of the details of the ongoing war. He writes, "Sure, we had relatives who were caught up in the Holocaust. Hitler was not a popular fellow in our household ... But on the other hand, I was fairly insulated from the horrors of the war." His sister, Carol, said that their mother "above all wanted to protect Carl ... She had an extraordinarily difficult time dealing with World War II and the Holocaust."^[6]:15 Sagan's book, The Demon-Haunted World (1996), included his memories of this conflicted period, when his family dealt with the realities of the war in Europe, but tried to prevent it from undermining his optimistic spirit.^[7]

Inquisitiveness about nature[link]

Soon after entering elementary school, he began to express a strong inquisitiveness about nature. Sagan recalled taking his first trips to the public library alone, at the age of five, when his mother got him a library card. He wanted to learn what stars were, since none of his friends or their parents could give him a clear answer:

I went to the librarian and asked for a book about stars ... And the answer was stunning. It was that the Sun was a star but really close. The stars were suns, but so far away they were just little points of light ... The scale of the universe suddenly opened up to me. It was a kind of religious experience. There was a magnificence to it, a grandeur, a scale which has never left me. Never ever left me.^[6]:18

About the time he was six or seven, he and a close friend took trips to the American Museum of Natural History in New York City. While there, they went to the Hayden Planetarium and walked around the museum's exhibits of space objects, such as meteorites, and displays of dinosaurs and animals in natural settings. Sagan writes about those visits:

I was transfixed by the dioramas—lifelike representations of animals and their habitats all over the world. Penguins on the dimly lit Antarctic ice; ... a family of gorillas, the male beating his chest, ... an American grizzly bear standing on his hind legs, ten or twelve feet tall, and staring me right in the eye.^[6]:18

His parents helped nurture his growing interest in science by buying him chemistry sets and reading materials.^[8] His interest in space, however, was his primary focus, especially after reading science fiction stories by writers such as Edgar Rice Burroughs, which stirred his imagination about life on other planets, such as Mars. According to biographer Ray Spangenburg, these early years as Sagan tried to understand the mysteries of the planets, became a "driving force in his life, a continual spark to his intellect, and a quest that would never be forgotten."^[7]

Education and scientific career[link]

He attended the University of Chicago, where he participated in the Ryerson Astronomical Society,^[9] received a bachelor of arts in self-proclaimed "nothing" with general and special honors in 1954, a bachelor of science in physics in 1955, and a master of science in physics in 1956 before earning a PhD in astronomy and astrophysics in 1960.^[10][11][12] During his time as an honors program undergraduate, Sagan worked in the laboratory of the geneticist H. J. Muller and wrote a thesis on the origins of life with physical chemist H.C. Urey. From 1960 to 1962 Sagan was a Miller Fellow at the University of California, Berkeley. From 1962 to 1968, he worked at the Smithsonian Astrophysical Observatory in Cambridge, Massachusetts.

Sagan lectured and did research at Harvard University until 1968, when he moved to Cornell University in Ithaca, New York. He became a full Professor at Cornell in 1971, and he directed the Laboratory for Planetary Studies there. From 1972 to 1981, Sagan was the Associate Director of the Center for Radio Physics and Space Research at Cornell.

Sagan was associated with the US space program from its inception. From the 1950s onward, he worked as an advisor to NASA, where one of his duties included briefing the Apollo astronauts before their flights to the Moon. Sagan contributed to many of the robotic spacecraft missions that explored the solar system, arranging experiments on many of the expeditions. He conceived the idea of adding an unalterable and universal message on spacecraft destined to leave the solar system that could potentially be understood by any extraterrestrial intelligence that might find it. Sagan assembled the first physical message that was sent into space: a gold- anodized plaque, attached to the space probe Pioneer 10, launched in 1972. Pioneer 11, also carrying another copy of the plaque, was launched the following year. He continued to refine his designs; the most elaborate message he helped to develop and assemble was the Voyager Golden Record that was sent out with the Voyager space probes in 1977. Sagan often challenged the decisions to fund the Space Shuttle and Space Station at the expense of further robotic missions.^[13]

Sagan taught a course on critical thinking at Cornell University until he died in 1996 from pneumonia, a few months after finding that he was in remission of myelodysplastic syndrome.

Scientific achievements[link]

Sagan's contributions were central to the discovery of the high surface temperatures of the planet Venus. In the early 1960s no one knew for certain the basic conditions of that planet's surface, and Sagan listed the possibilities in a report later depicted for popularization in a Time-Life book, Planets. His own view was that Venus was dry and very hot as opposed to the balmy paradise others had imagined. He had investigated radio emissions from Venus and concluded that there was a surface temperature of 500 °C (900 °F). As a visiting scientist to NASA's Jet Propulsion Laboratory, he contributed to the first Mariner missions to Venus, working on the design and management of the project. Mariner 2 confirmed his conclusions on the surface conditions of Venus in 1962.

Sagan was among the first to hypothesize that Saturn's moon Titan might possess oceans of liquid compounds on its surface and that Jupiter's moon Europa might possess subsurface oceans of water. This would make Europa potentially habitable.^[14] Europa's subsurface ocean of water was later indirectly confirmed by the spacecraft Galileo. The mystery of Titan's reddish haze was also solved with Sagan's help. The reddish haze was revealed to be due to complex organic molecules constantly raining down onto Titan's surface.^[15]

He further contributed insights regarding the atmospheres of Venus and Jupiter as well as seasonal changes on Mars. Sagan established that the atmosphere of Venus is extremely hot and dense with pressures increasing steadily all the way down to the surface. He also perceived global warming as a growing, man-made danger and likened it to the natural development of Venus into a hot, life-hostile planet through a kind of runaway greenhouse effect. Sagan and his Cornell colleague Edwin Ernest Salpeter speculated about life in Jupiter's clouds, given the planet's dense atmospheric composition rich in organic molecules. He studied the observed color variations on Mars' surface and concluded that they were not seasonal or vegetational changes as most believed but shifts in surface dust caused by windstorms.

Sagan is best known, however, for his research on the possibilities of extraterrestrial life, including experimental demonstration of the production of amino acids from basic chemicals by radiation.^[16]

He is also the 1994 recipient of the Public Welfare Medal, the highest award of the National Academy of Sciences for "distinguished contributions in the application of science to the public welfare."^[17] He was denied membership in the Academy, reportedly because his media activities made him unpopular with many other scientists.^[18]

Scientific advocacy[link]

Planetary Society members at the organization's founding. Carl Sagan is seated on the right.

Sagan's ability to convey his ideas allowed many people to better understand the cosmos—simultaneously emphasizing the value and worthiness of the human race, and the relative insignificance of the Earth in comparison to the universe. He delivered the 1977 series of Royal Institution Christmas Lectures in London.^[19] He hosted and, with Ann Druyan, co-wrote and co-produced the highly popular thirteen-part PBS television series Cosmos: A Personal Voyage modeled on Jacob Bronowski's The Ascent of Man.

Cosmos covered a wide range of scientific subjects including the origin of life and a perspective of our place in the universe. The series was first broadcast by the Public Broadcasting Service in 1980, winning an Emmy and a Peabody Award. It has been broadcast in more than 60 countries and seen by over 500 million people,^[3][20] making it the most widely watched PBS program in history.^[21] In addition, Time magazine ran a cover story about Sagan soon after the show broadcast, referring to him as "creator, chief writer and host-narrator of the new public television series Cosmos, [and] takes the controls of his fantasy spaceship."^[22]

Sagan was a proponent of the search for extraterrestrial life. He urged the scientific community to listen with radio telescopes for signals from potential intelligent extraterrestrial life-forms. Sagan was so persuasive that by 1982 he was able to get a petition advocating SETI published in the journal Science and signed by 70 scientists including seven Nobel Prize winners. This was a tremendous increase in the respectability of this controversial field. Sagan also helped Dr. Frank Drake write the Arecibo message, a radio message beamed into space from the Arecibo radio telescope on November 16, 1974, aimed at informing potential extraterrestrials about Earth.

Sagan was chief technology officer of the professional planetary research journal Icarus for twelve years. He co-founded the Planetary Society, the largest space-interest group in the world, with over 100,000 members in more than 149 countries, and was a member of the SETI Institute Board of Trustees. Sagan served as Chairman of the Division for Planetary Science of the American Astronomical Society, as President of the Planetology Section of the American Geophysical Union, and as Chairman of the Astronomy Section of the American Association for the Advancement of Science.

At the height of the Cold War, Sagan became involved in public awareness efforts for the effects of nuclear war when a mathematical climate model suggested that a substantial nuclear exchange could upset the delicate balance of life on Earth. He was one of five authors—the "S" of the "TTAPS" report as the research paper came to be known. He eventually co-authored the scientific paper hypothesizing a global nuclear winter following nuclear war.^[23] He also co-authored the book A Path Where No Man Thought: Nuclear Winter and the End of the Arms Race, a comprehensive examination of the phenomenon of nuclear winter.

Sagan also wrote books to popularize science which reflected and expanded upon some of the themes of A Personal Voyage, and became the best-selling science book ever published in English;^[24] The Dragons of Eden: Speculations on the Evolution of Human Intelligence, which won a Pulitzer Prize; and Broca's Brain: Reflections on the Romance of Science. Sagan also wrote the best-selling science fiction novel Contact in 1985, based on a film treatment he wrote with his wife in 1979, but he did not live to see the book's 1997 motion picture adaptation, which starred Jodie Foster and won the 1998 Hugo Award for Best Dramatic Adaption.

Pale Blue Dot: Earth is a bright pixel when photographed from "Voyager 1" six billion kilometers out (past Pluto). Sagan encouraged NASA to generate this image.

He wrote a sequel to Cosmos, Pale Blue Dot: A Vision of the Human Future in Space, which was selected as a notable book of 1995 by The New York Times. He appeared on PBS' Charlie Rose program in January 1995.^[25] Sagan also wrote an introduction for the bestselling book by Stephen Hawking, A Brief History of Time. Sagan was also known for his popularization of science, his efforts to increase scientific understanding among the general public, and his positions in favor of scientific skepticism and against pseudoscience, such as his debunking of the Betty and Barney Hill abduction. To mark the tenth anniversary of Sagan's death, David Morrison, a former student of Sagan, recalled "Sagan's immense contributions to planetary research, the public understanding of science, and the skeptical movement" in Skeptical Inquirer.^[26]

Sagan hypothesized in January 1991 that enough smoke from the 1991 Kuwaiti oil fires "might get so high as to disrupt agriculture in much of South Asia ..." He later conceded in The Demon-Haunted World that this prediction did not turn out to be correct: "it was pitch black at noon and temperatures dropped 4°–6 °C over the Persian Gulf, but not much smoke reached stratospheric altitudes and Asia was spared."^[27] A 2007 study noted that modern computer models have been applied to the Kuwait oil fires, finding that individual smoke plumes are not able to loft smoke into the stratosphere, but that smoke from fires covering a large area, like some forest fires or the burning of cities that would be expected to follow a nuclear strike, would loft significant amounts of smoke into the stratosphere.^{[28][29][30][31]}

In his later years Sagan advocated the creation of an organized search for near Earth objects that might impact the Earth.^[32] When others suggested creating large nuclear bombs that could be used to alter the orbit of a NEO that was predicted to hit the Earth, Sagan proposed the Deflection Dilemma: If we create the ability to deflect an asteroid away from the Earth, then we also create the ability to deflect an asteroid towards the Earth—providing an evil power with a true doomsday bomb.^[33][34]

Billions and billions[link]

Sagan with a model of the Viking Lander probes which would land on Mars. Sagan examined possible landing sites for Viking along with Mike Carr and Hal Masursky.

From Cosmos and his frequent appearances on The Tonight Show Starring Johnny Carson, Sagan became associated with the catchphrase "billions and billions". Sagan stated that he never actually used the phrase in the Cosmos series.^[35] The closest that he ever came was in the book Cosmos, where he talked of "billions upon billions":^[36]

A galaxy is composed of gas and dust and stars—billions upon billions of stars.

—Carl Sagan, Cosmos, chapter 1, page 3^[37]

However, his frequent use of the word billions, and distinctive delivery emphasizing the "b" (which he did intentionally, in place of more cumbersome alternatives such as "billions with a 'b'", in order to distinguish the word from "millions" in viewers' minds),^[35] made him a favorite target of comic performers, including Johnny Carson,^[38] Gary Kroeger, Mike Myers, Bronson Pinchot, Penn Jillette, Harry Shearer, and others. Frank Zappa satirized the line in the song "Be In My Video", noting as well "atomic light". Sagan took this all in good humor, and his final book was entitled Billions and Billions, which opened with a tongue-in-cheek discussion of this catchphrase, observing that Carson was an amateur astronomer and that Carson's comic caricature often included real science.^[35]

Similarly he is also known for expressing wonderment at the vastness of space and time, as in his phrase "The total number of stars in the Universe is larger than all the grains of sand on all the beaches of the planet Earth."

Sagan units[link]

As a humorous tribute to him, a sagan has been defined as a unit of measurement equal to at least four billion, since the smallest number that may be described as billions and billions must be two billion plus two billion.^[39][40]

Social concerns[link]

Sagan believed that the Drake equation, on substitution of reasonable estimates, suggested that a large number of extraterrestrial civilizations would form, but that the lack of evidence of such civilizations highlighted by the Fermi paradox suggests technological civilizations tend to self-destruct. This stimulated his interest in identifying and publicizing ways that humanity could destroy itself, with the hope of avoiding such a cataclysm and eventually becoming a spacefaring species. Sagan's deep concern regarding the potential destruction of human civilization in a nuclear holocaust was conveyed in a memorable cinematic sequence in the final episode of Cosmos, called "Who Speaks for Earth?" Sagan had already resigned from the Air Force Scientific Advisory Board and voluntarily surrendered his top secret clearance in protest over the Vietnam War.^[41] Following his marriage to his third wife (novelist Ann Druyan) in June 1981, Sagan became more politically active—particularly in opposing escalation of the nuclear arms race under President Ronald Reagan.

In March 1983, Reagan announced the Strategic Defense Initiative—a multi-billion dollar project to develop a comprehensive defense against attack by nuclear missiles, which was quickly dubbed the "Star Wars" program. Sagan spoke out against the project, arguing that it was technically impossible to develop a system with the level of perfection required, and far more expensive to build than for an enemy to defeat through decoys and other means—and that its construction would seriously destabilize the nuclear balance between the United States and the Soviet Union, making further progress toward nuclear disarmament impossible.

When Soviet leader Mikhail Gorbachev declared a unilateral moratorium on the testing of nuclear weapons, which would begin on August 6, 1985—the 40th anniversary of the atomic bombing of Hiroshima—the Reagan administration dismissed the dramatic move as nothing more than propaganda, and refused to follow suit. In response, US anti-nuclear and peace activists staged a series of protest actions at the Nevada Test Site, beginning on Easter Sunday in 1986 and continuing through 1987. Hundreds of people were arrested, including Sagan, who was arrested on two separate occasions as he climbed over a chain-link fence at the test site.^[42]

Personal life and beliefs[link]

Sagan was married three times—in 1957, to biologist Lynn Margulis, mother of Dorion Sagan and Jeremy Sagan; in 1968, to artist Linda Salzman, mother of Nick Sagan; and in 1981, to author Ann Druyan, mother of Alexandra Rachel (Sasha) Sagan and Samuel Democritus Sagan. His marriage to Druyan continued until his death in 1996.

Isaac Asimov described Sagan as one of only two people he ever met whose intellect surpassed his own. The other, he claimed, was the computer scientist and artificial intelligence expert Marvin Minsky.^[43]

Sagan wrote frequently about religion and the relationship between religion and science, expressing his skepticism about the conventional conceptualization of God as a sapient being. For example:

"Some people think God is an outsized, light-skinned male with a long white beard, sitting on a throne somewhere up there in the sky, busily tallying the fall of every sparrow. Others—for example Baruch Spinoza and Albert Einstein—considered God to be essentially the sum total of the physical laws which describe the universe. I do not know of any compelling evidence for anthropomorphic patriarchs controlling human destiny from some hidden celestial vantage point, but it would be madness to deny the existence of physical laws."^[44]

In another description of his view of God, Sagan emphatically writes:

"The idea that God is an oversized white male with a flowing beard who sits in the sky and tallies the fall of every sparrow is ludicrous. But if by God one means the set of physical laws that govern the universe, then clearly there is such a God. This God is emotionally unsatisfying... it does not make much sense to pray to the law of gravity."^[45]

On atheism, Sagan commented in 1981:

"An atheist is someone who is certain that God does not exist, someone who has compelling evidence against the existence of God. I know of no such compelling evidence. Because God can be relegated to remote times and places and to ultimate causes, we would have to know a great deal more about the universe than we do now to be sure that no such God exists. To be certain of the existence of God and to be certain of the nonexistence of God seem to me to be the confident extremes in a subject so riddled with doubt and uncertainty as to inspire very little confidence indeed".^[46]

In reply to a question in 1996 about his religious beliefs, Sagan answered, "I'm agnostic."^[47] Sagan's views on religion have been interpreted as a form of pantheism comparable to Einstein's belief in Spinoza's God.^[48] Sagan maintained that the idea of a creator of the universe was difficult to prove or disprove and that the only conceivable scientific discovery that could challenge it would be an infinitely old universe.^[49] According to his last wife, Ann Druyan, he was not a believer:

When my husband died, because he was so famous and known for not being a believer, many people would come up to me—it still sometimes happens—and ask me if Carl changed at the end and converted to a belief in an afterlife. They also frequently ask me if I think I will see him again. Carl faced his death with unflagging courage and never sought refuge in illusions. The tragedy was that we knew we would never see each other again. I don't ever expect to be reunited with Carl.^[50]

In 2006, Ann Druyan edited Sagan's 1985 Glasgow Gifford Lectures in Natural Theology into a book, The Varieties of Scientific Experience: A Personal View of the Search for God, in which he elaborates on his views of divinity in the natural world.

Carl Sagan (center) speaks with CDC employees in 1988.

Sagan is also widely regarded as a freethinker or skeptic; one of his most famous quotations, in Cosmos, was, "Extraordinary claims require extraordinary evidence"^[51] (called the "Sagan Standard" by some^[52]). This was based on a nearly identical statement by fellow founder of the Committee for the Scientific Investigation of Claims of the Paranormal, Marcello Truzzi, "An extraordinary claim requires extraordinary proof."^[53][54] This idea originated with Pierre-Simon Laplace (1749–1827), a French mathematician and astronomer who said, "The weight of evidence for an extraordinary claim must be proportioned to its strangeness."^[55]

Late in his life, Sagan's books elaborated on his skeptical, naturalistic view of the world. In The Demon-Haunted World: Science as a Candle in the Dark, he presented tools for testing arguments and detecting fallacious or fraudulent ones, essentially advocating wide use of critical thinking and the scientific method. The compilation Billions and Billions: Thoughts on Life and Death at the Brink of the Millennium, published in 1997 after Sagan's death, contains essays written by Sagan, such as his views on abortion, and his widow Ann Druyan's account of his death as a skeptic, agnostic, and freethinker.

Sagan warned against humans' tendency towards anthropocentrism. He was the faculty adviser for the Cornell Students for the Ethical Treatment of Animals. In the Cosmos chapter "Blues For a Red Planet", Sagan wrote, "If there is life on Mars, I believe we should do nothing with Mars. Mars then belongs to the Martians, even if the Martians are only microbes."^[56]

Sagan was a user and advocate of marijuana. Under the pseudonym "Mr. X", he contributed an essay about smoking cannabis to the 1971 book Marihuana Reconsidered.^[57][58] The essay explained that marijuana use had helped to inspire some of Sagan's works and enhance sensual and intellectual experiences. After Sagan's death, his friend Lester Grinspoon disclosed this information to Sagan's biographer, Keay Davidson. The publishing of the biography, Carl Sagan: A Life, in 1999 brought media attention to this aspect of Sagan's life.^[59][60][61] Not long after his death, widow Ann Druyan had gone on to preside over the board of directors of NORML, a foundation dedicated to reforming cannabis laws.^[62]

In 1994, engineers at Apple Computer code-named the Power Macintosh 7100 "Carl Sagan" in the hope that Apple would make "billions and billions" with the sale of the PowerMac 7100.^[4] The name was only used internally, but Sagan was concerned that it would become a product endorsement and sent Apple a cease and desist letter. Apple complied, but engineers retaliated by changing the internal codename to "BHA" for "Butt-Head Astronomer".^[63][64] Sagan then sued Apple for libel, a form of defamation, in federal court. The court granted Apple's motion to dismiss Sagan's claims and opined in dicta that a reader aware of the context would understand Apple was "clearly attempting to retaliate in a humorous and satirical way", and that "It strains reason to conclude that Defendant was attempting to criticize Plaintiff's reputation or competency as an astronomer. One does not seriously attack the expertise of a scientist using the undefined phrase 'butt-head'."^[63][65] Sagan then sued for Apple's original use of his name and likeness, but again lost.^[66] Sagan appealed the ruling.^[66] In November 1995, an out of court settlement was reached and Apple's office of trademarks and patents released a conciliatory statement that "Apple has always had great respect for Dr. Sagan. It was never Apple's intention to cause Dr. Sagan or his family any embarrassment or concern."^[67]

Sagan briefly served as an adviser on Stanley Kubrick's film 2001: A Space Odyssey.^[6] Sagan proposed that the film would suggest, rather than depict, extraterrestrial superintelligence.^[68]

Sagan and UFOs[link]

Sagan had some interest in UFO reports from at least August 3, 1952 when he wrote a letter to U.S. Secretary of State Dean Acheson to ask how the U.S. would respond if flying saucers turned out to be extraterrestrial.^[69] He later had several conversations on the subject in 1964 with Jacques Vallee.^[70] Though quite skeptical of any extraordinary answer to the UFO question, Sagan thought scientists should study the phenomenon, at least because there was widespread public interest in UFO reports.

Stuart Appelle notes that Sagan "wrote frequently on what he perceived as the logical and empirical fallacies regarding UFOs and the abduction experience. Sagan rejected an extraterrestrial explanation for the phenomenon but felt there were both empirical and pedagogical benefits for examining UFO reports and that the subject was, therefore, a legitimate topic of study."^[71]

In 1966, Sagan was a member of the Ad Hoc Committee to Review Project Blue Book, the U.S. Air Force's UFO investigation project. The committee concluded Blue Book had been lacking as a scientific study, and recommended a university-based project to give the UFO phenomenon closer scientific scrutiny. The result was the Condon Committee (1966–1968), led by physicist Edward Condon, and in their final report they formally concluded that UFOs, regardless of what any of them actually were, did not behave in a manner consistent with a threat to national security.

Ron Westrum writes that "The high point of Sagan's treatment of the UFO question was the AAAS's symposium in 1969. A wide range of educated opinions on the subject were offered by participants, including not only proponents such as James McDonald and J. Allen Hynek but also skeptics like astronomers William Hartmann and Donald Menzel. The roster of speakers was balanced, and it is to Sagan's credit that this event was presented in spite of pressure from Edward Condon".^[70] With physicist Thornton Page, Sagan edited the lectures and discussions given at the symposium; these were published in 1972 as UFOs: A Scientific Debate. Some of Sagan's many books examine UFOs (as did one episode of Cosmos) and he claimed a religious undercurrent to the phenomenon.